<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        h2,
        p {
            margin: 0;
        }

        .box {
            margin: 30px auto;
            width: 300px;
        }

        #user,
        #message {
            box-sizing: border-box;
            width: 300px;
            border: 1px solid #000;
            padding: 10px;
            height: 100px;
            resize: none;
            display: block;
        }

        #user {
            padding: 0 10px;
            height: 30px;
            margin-bottom: 10px;
        }

        #btn {
            display: block;
            margin: 10px auto;
            width: 60%;
            height: 40px;
        }

        #list {
            border-top: 1px solid #000;
            padding: 10px 0 0;
            margin: 0;
            list-style: none;
        }

        #list li {
            position: relative;
            font: 14px/30px "宋体";
            border-bottom: 1px solid #000;
            padding: 0 15px;
            overflow: hidden;
        }

        .clos {
            position: absolute;
            right: 5px;
            top: 10px;
        }

        .replay {
            position: absolute;
            right: 5px;
            top: 35px;
        }

        .mask {
            width: 100vw;
            height: 100vh;
            background: black;
            opacity: .3;
            position: absolute;
            left: 0;
            top: 0;
            display: none;
        }

        .comfirm {
            width: 200px;
            height: 120px;
            background: white;
            text-align: center;
            position: absolute;
            left: 50%;
            top: 30%;
            border-radius: 5px;
            transform: translate(-50%, -50%);
            overflow: hidden;
            display: none;

        }

        .comfirm button {
            /* position: absolute; */
            /* right: 10px; */
            float: right;
            margin-top: 20px;
            margin-right: 10px;
        }
    </style>
</head>

<body>
    <div class="box">

        <textarea id="message">留言内容</textarea>
        <button id="btn">提交留言</button>
        <ul id="list">
            <!-- <li style="height: auto">
            <h2 class="user">小王说:</h2>
            <p>呼叫无敌小明</p>
            <a href="javascript:;" class="clos">删除</a>
            <a href="javascript:;" class="replay">回复</a>
        </li> -->
            <!-- <li style="height: auto">
            <h2 class="user">老师说:</h2>
            <p>小明滚出去</p>
            <p>回复的内容</p>
            <a href="javascript:;" class="clos">删除</a>
            <a href="javascript:;" class="replay">回复</a>
        </li> -->
        </ul>
        <div class="mask">

        </div>

    </div>
    <script>

        var messageEle = document.querySelector("#message");
        var addBtn = document.querySelector("#btn");
        var list = document.querySelector("#list");
        var maskEle = document.querySelector(".mask");
        var comfirmEle = document.querySelector(".comfirm");
        var btns = document.querySelectorAll(".comfirm button");
        var inputEle = document.querySelector(".comfirm input");

        addBtn.onclick = function () {
            let dateObj = new Date();
            let hours = dateObj.getHours() > 12 ? `下午${dateObj.getHours() - 12}点` : `上午${dateObj.getHours()}点`;
            var nowTime = `${dateObj.getDate()}号${hours}${dateObj.getMinutes()}分`;
            var message = messageEle.value;
            var li = document.createElement("li");
            li.setAttribute("style", 'height: auto');
            li.innerHTML = '<h2 class="user">' + nowTime + ':</h2><p>' + message + '</p><a href="javascript:;" class="clos">删除</a>';
            var delBtn = li.querySelector(".clos");
            delBtn.onclick = function () {
                this.parentNode.remove();
            }
            if(!list.firstElementChild){
                list.appendChild(li);
            }else{
                list.insertBefore(li,list.firstElementChild);
            }
        }


    </script>
</body>

</html>